December weather forecast and climate
Sewaren, NJ

Weather in December

The first month of the winter, December, is also a frosty month in Sewaren, New Jersey, with temperature in the range of an average low of 33.4°F (0.8°C) and an average high of 43.3°F (6.3°C).

Temperature

In Sewaren, the average high-temperature marginally drops, from a cool 52°F (11.1°C) in November, to a chilly 43.3°F (6.3°C). In Sewaren, New Jersey, in December, the average low-temperature is 33.4°F (0.8°C).

Humidity

In December, the average relative humidity in Sewaren is 76%.

Rainfall

The wettest months in Sewaren are July and December, with an average 3.31" (84mm) of rainfall.

Snowfall

Months with snowfall are January through April, October through December. In Sewaren, during December, snow falls for 3.4 days and regularly aggregates up to 1.34" (34mm) of snow. Throughout the year, there are 19.5 snowfall days, and 8.35" (212mm) of snow is accumulated.

Ocean temperature

In Sewaren, the average seawater temperature is 47.1°F (8.4°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

December has the shortest days of the year in Sewaren, with an average of 9.3h of daylight.

Sunshine

The average sunshine in Sewaren is 4.9h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Sewaren. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to the UV radiation for ordinary individuals.
Note: The average daily UV index of 2 transform into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in Sewaren?

The average relative humidity in December is 76%.

What is the wettest month in Sewaren?

Months with the most rainfall are July and December, with an average 3.31" (84mm) of precipitation.

How much does it rain in Sewaren in December?

In Sewaren, New Jersey, in December, during 11.5 rainfall days, 3.31" (84mm) of precipitation is typically accumulated.

How much does it snow in Sewaren in December?

In Sewaren, during December, snow falls for 3.4 days and regularly aggregates up to 1.34" (34mm) of snow.

What is the ocean temperature in December in Sewaren?

In Sewaren, in December, the average water temperature is 47.1°F (8.4°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the month with the shortest days in Sewaren?

The month with the shortest days in Sewaren is December, with an average of 9.3h of daylight.

What is the average length of the day in December in Sewaren?

In December, the average length of the day in Sewaren is 9.3h.

How long on average sun shines in December in Sewaren?

The average sunshine in December is 4.9h.

When is the lowest UV index in Sewaren?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Sewaren, New Jersey.

How high is the UV index in December in Sewaren?

In December, the average daily maximum UV index in Sewaren, New Jersey, is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unprotected exposure to the UV radiation.

Average temperature in December
Sewaren, NJ

Average temperature in December - Sewaren, NJ
  • Average high temperature in December: 43.3°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (36.9°F).

  • Average low temperature in December: 33.4°F

The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (25.9°F).

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Average pressure in December
Sewaren, NJ

Average pressure in December - Sewaren, NJ
  • Average pressure in December: 30.08"

The month with the highest atmospheric pressure is November (30.11").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in December
Sewaren, NJ

Average wind speed in December - Sewaren, NJ
  • Average wind speed in December: 9.6mph

The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

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Average humidity in December
Sewaren, NJ

Average humidity in December - Sewaren, NJ
  • Average humidity in December: 76%

Months with the highest relative humidity are February and May (77%).
Months with the lowest relative humidity are March, April, August and November (73%).

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Average rainfall in December
Sewaren, NJ

Average rainfall in December - Sewaren, NJ
  • Average rainfall in December: 3.31"

The wettest months (with the highest rainfall) are July and December (3.31").
The driest month (with the least rainfall) is September (1.81").

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Average rainfall days in December
Sewaren, NJ

Average rainfall days in December - Sewaren, NJ
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is July (16.2 days).
The month with the least rainy days is January (9.3 days).

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Average snowfall in December
Sewaren, NJ

Average snowfall in December - Sewaren, NJ
  • Average snowfall in December: 1.34"

The month with the highest snowfall is March (3.39").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Sewaren, NJ

Average snowfall days in December - Sewaren, NJ
  • Average snowfall days in December: 3.4 days

The month with the highest number of snowfall days is January (5.8 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in December
Sewaren, NJ

Average sea temperature in December - Sewaren, NJ
  • Average sea temperature in December: 47.2°F

The best month for swimming (with the highest average sea temperature) is August (74.1°F).
The coldest month (with the lowest average sea temperature) is February (39.7°F).

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Average daylight in December /
Average sunshine in December
Sewaren, NJ

Average daylight in December / Average sunshine in December - Sewaren, NJ
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in December: 4.9h

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.7h).

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Average sunshine days in December
Sewaren, NJ

Average sunshine days in December - Sewaren, NJ
  • Average sunshine days in December: 15.8 days

The month with the most sunshine days is November (18.2 days).
The month with the least sunshine days is June (12.2 days).

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Average UV index in December
Sewaren, NJ

Average UV index in December - Sewaren, NJ
  • Average UV index in December: 2

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in December
Sewaren, NJ

Average cloud cover in December - Sewaren, NJ
  • Average cloud cover in December: 48

Months with the most cloud cover are February, March and December (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in December
Sewaren, NJ

Average visibility in December - Sewaren, NJ
  • Average visibility in December: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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